Sandbox. Woman comparators.

Author: SkyrocketStan

SandBox/src/com/rakitov/sandbox/comparators2/Main.java

@@ -1,6 +1,7 @@
 package com.rakitov.sandbox.comparators2;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
@@ -14,13 +15,37 @@ public static void main(String[] args) {
     women.add(new Woman("Kate", 34, 168, 67, 2));
     women.add(new Woman("Jackie", 44, 183, 57, 1));
 
+    // Anonymous new Comparator<Woman>() can be replaced with lambda
+    Comparator<Woman> compareByName = new Comparator<Woman>() {
+      @Override
+      public int compare(Woman w1, Woman w2) {
+        return w1.getName().compareTo(w2.getName());
+      }
+    };
+    // Like this, but it Can be replaced with 'Comparator.comparing'
+    Comparator<Woman> compareByNameLambda = (w1, w2) -> w1.getName().compareTo(w2.getName());
+    // Can be replaced with 'Comparator.comparing'
+    Comparator<Woman> compareByNameComparator = Comparator.comparing(Woman::getName);
 
-    Comparator<Woman> compareByHeight = Comparator.comparingInt(Woman::getHeight);
+
+    // Lambda can be replaced with method reference
+    Comparator<Woman> compareByHeight = Comparator.comparingInt(woman -> woman.getHeight());
 
     System.out.println("Before sort");
     women.forEach(System.out::println);
-    System.out.println("\nAfter sort");
-    women.sort(compareByHeight);
+    System.out.println("\nAfter sort height");
+
+    // Collections.sort could be replaced with List.sort
+    Collections.sort(women, compareByHeight);
+    women.forEach(System.out::println);
+    System.out.println("\nAfter sort weight");
+    // Can sort like this too.
+    // and another way to make a comparator
+    women.sort(Comparator.comparingInt(Woman::getWeight));
+    women.forEach(System.out::println);
+
+    System.out.println("\nAfter name sort");
+    women.sort(compareByName);
     women.forEach(System.out::println);
 
   }

SandBox/src/com/rakitov/sandbox/comparators2/Woman.java

@@ -69,8 +69,8 @@ public void setChildren(int children) {
 
   @Override
   public String toString() {
-    return String.format("%s is %d years old. Height: %d kg. Weight: %d cm. Number of " +
+    return String.format("%s is %d years old. Weight: %d kg. Height: %d cm. Number of " +
                                     "children: %d",
-                         name, age, height, weight, children);
+                         name, age, weight, height, children);
   }
 }